Here's a look at how it breaks down across the country, via the American Petroleum Institute:

Average total gas taxes and fees around the U.S.

Credit American Petroleum Institute

Michigan's fuel taxes are higher mostly because the state charges sales tax on top of its motor fuel tax.

It's one of only eight states to do so.

This chart shows what makes up the price of a gallon of gas in Michigan, when it retailed at $3.81 per gallon.

As you can guess, the proposal to fix Michigan's roads by raising fuel taxes has its critics. The Detroit Free Press quotes a Facebook post by Americans for Prosperity's Scott Hagerstrom:

“Why are legislators promoting and passing plans that will give us the highest tax on gasoline? Elected officials aren't being held accountable for the dollars they currently take from Michigan drivers.”

But advocates for raising the tax say people don't understand a key fact: state sales taxes paid at the pump don't go to the roads.

"It's the biggest public policy problem we have," according to Lance T. Binoniemi of the Michigan Infrastructure and Transportation Association. "The general public does not understand that the 6 percent tax does not go to funding roads and bridges."

State road funding in Michigan comes from the 19-cents-per-gallon state motor fuel tax.

By contrast, our neighbor to the south, Ohio, charges a 28-cents-per-gallon state motor fuel tax, with no other state taxes or fees levied on a gallon of gas.

According to Crain's Detroit Business, the proposal being put forward by Michigan lawmakers, as it stands now, would raise fuel taxes for road funding this way:

The tax would start at 9.5 percent, effectively increasing the state's 19-cents-a-gallon gasoline tax by 10 cents and doubling the 15-cent diesel tax assuming the statewide average wholesale price of gas is $3. The gas tax would rise to 11.5 percent (around 34 cents) in 2016 if prices stay intact, 13.5 percent (40 cents) in 2017 and 15.5 percent (46 cents) in 2018.